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(No Mollel.) l R v W. D. WILLIAMS.

DENTAL HANDPIBGB.

- No. 382,672. Patented May 8,-1'888.

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UNITED STATES PA'IENT OFFICE;

I WALTER DILLoN WILLIAMS, oE oAMDEN, NEW JERSEY, ASSIeNoE'oE ONE--l HALE 'ro A. J.EULLMEE, 0E SAME PLAGE.

DENTAL HANo-'PlEoI-z.

SPECIFICATION forming part'of Letters Patentino. 382,672, atea 'May e, 198e.

'Appli-cation tI'eaJupuaryes, leer. sel-in No. 225,901. (No modem- To aZZ' whom it may concern:

Be it known that LWALTEE DILLoN WIL- LIAMS, a citizen of the United' States, residing at Camden, in the'county of Camden and State of New Jersey, have invented certain new and useful Improvements in Dental Hand-Pieces; and I do declare the following tobe a full, clear, and exact description of the invention, such as Will enable others skilled in the art to which zo it appertains to make and use the Same, reference being hadto the accompanying drawings, and to the letters and figures of reference marked. thereon, which form a part of this specification.

My invention relates to improvements in that class of dental hand-pieces which are composed of a hollow casing inelosing a spindle provided at one end with mechanism for holding burr-drills or similar tools, and connected 2o at the opposite end to the iexible rotary shaft ofasuitable dental engine for rotating saidv drills o r tools, the object of my invention being to-provi'dea dental hand-piece which shall be simple, accurate, and reliable, both in its construction and operation, capable of being readily manipulated to secure a drill or tool in position therein,or for the ready removal of .said tool therefrom in the simplest and best possible manner.

3o To these ends my invention consists, essentially, of the novel details of construction and general arrangement of parts, as will be hereinafter fully described, and specifically designated in the claims.

In the accompanying drawings, Figure l represents a side elevation of my complete device; Fig. 2, a vertical longitudinal section of the same; Fig. 3, a detail View of the casing; Fig. 4, aside elevation of the tool-holding spin- 4o dle and its attachments; Fig. 5, a similar view of the spindle without the attachment; Fig.

6, a detail sectional View of the tool-holding mechanism of the spindle, and Fig. 7 Ia detail. view of the cam-sleeve and inwardly-projecting lugs.

Similar letters of reference occuring on the several tigures indicate like parts'.A

In carrying out my invention the outer casing, A, of the hand-piece is preferably of cylindrical form, tapering slightlyA toward the vtool-holding end, and adapted to receive the continuous spindle B, as fully shown inFig'Z. The outer endk of the spindle B is bored out ya suitable depth and diameter to receive the shank of the drill ortool, andis providedwith 5 5 two cones, a c', locatedy a short distance apartA and having their beveled surfaces projecting in opposite directions'while elongated slits'b are provided in the-sides of the spindle below the outer cone, @,to form fiexible jaws,the said 6o slits extending through the second cone, a', as shown. A The conca, upon the outer end of the spindle B, is adapted to rest ina corresponding-shaped bearing in the taperingy end of the casing A, while the opposite rearkend of the spindle is adapted to freely revolve in afbearing in a screw-threaded shoulder, C, fitting the rear of the said casing, to provide a continuous straight journal having a true revolving center to take up all lostmotion. 7e

Near the outer end of the spindle B is provided a hollowrsleeve, D,which its upon theV said spindle,with its outer end impinging normally upon the beveled Surface of the cone a', to compress the fiexible jaws together through 7 5 the medium of the spiral spring c, arranged upon the saidspindle between the base of the sleeve D and the collar d, also adj ustably fixedupon tlle spindle,as fully shown in Fig. 4.

Near the lower end of the hollow sleeve D, 8o Y v and extending around the cireu Inference ofthe same, is provided a groove or recess, e, for the reception therein ofthe lower end of ascrew, f,which projects through the cam-sleeve E,surrounding the outer central portion of the cas- '85 ing A,for drawing the sleeveD downward from its contact with thesplit cone a', to permit of j the ready removal of the drill or tool from the flexible jaws, as will be hereinafter more fully referred to. 9o v Near the lower end of the spindle and `adjusted thereon by a suitable set screw is pro-` Ivided a collar, g, which bears against the inner surface of the screw-'threaded shoulder C, to secure the spindle in position within thecasing A in such manner that the slightest wear upon the bearings of the spindle can be readily taken up by turning the sereW-threadedshoulder in the proper direction, -a set-screw, inprojecting through the casing A, being provided Ioo for holding the said shoulder C at any desired point of-fadjustment. Upon two sides of the central portion of the casing A are provided openings F,which are arranged in j uxtaposition with the groove or recess e in the lower end of the sleeve D, as fully shown in Fig. 3. Directly over the openings F is arranged a sleeve, E, which is provided upon its outer edge with a double cam, ZZ', one on each side, while a suitable setscrew,f, projectsthrough each cam into the recess e of the sleeve D. Fixed upon the casing A is also provided a collar, m, the inner edge of which conforms to and closely fits the contour of the (loable cam of the sleeve E, which is held normally against the said collar m by the action of the spiral spring n,arranged upon the casing within a recess within said sleeve E, as fully shown in the drawings.

The construction of my improved device being as above described, the operation Aof inserting a tool in position therein or of removing the same therefrom is accomplished by simply giving the cam-sleeve E a partial turn from right to left,which causes the inwardlyprojecting ends of the set-screws upon said sleeve to draw the sleeve D downward from its engagement with the cone of the spindle and allow the flexible jaws to expand,in order that a tool may be either inserted or withdrawn. By turning the sleeve E back to its normal position the sleeve D runs up by the force of the spring c upon the cone a and compresses the flexible jaws of the spindle to hold a tool in position therein until released in the manner already stated. It will thus be seen that by a simple turn of the cam-sleeve E any desired tool may be readily removed or replaced in the hand-piece without loss of time or involving the manipulation of intricate mechanism to accomplish such a result.

Having thus described my invention, what I claim as new and useful, and desire to secure by Letters Patent, is-

l. In a handpiece for dental engines, an outer casing having openings therein and provided with a stationary outer cam-collar, and a. cam-sleeve engaging with said cam-collar, having inwardly-projectinglugs, andthe spindle having a movablesleeve thereon, for the purposes speciied,substantially as described.

2. In a hand-piece for dental engines, the combination, with the hollow casing,ofatool holding spindle having a conical outer end, and a series ofjawshaving conical projections thereon, an adjustable collar situated near the inner end of said spindle, a spring and sleeve surrounding said spindle, a camsleeve having lugs projecting through openings in saidcasing and surrounding the same, and a screwthreaded collar situated at the end of said casing and adapted to come iu contact with said adjustable collar, substantially as described.

In testimony whereof Iax my signature in presence of two witnesses.

VALTER DILLON VILLI AMS.

Witnesses:

MARTIN V. BERG EN, S. D. BERGEN. 

